Which state has the most national parks?

Which state's license plates historically carry the slogan "First in Flight"? Which state's license plates carry the slogan "Famous Potatoes"? Which state is home to the most active volcanoes? Which state is home to Kīlauea, one of the world's most active volcanoes? Which state is home to the Black Hills? Which state is home to the Ozark Mountains' largest portion? Which state is home to Lake Tahoe along with Nevada? Which state is home to the Outer Banks barrier islands?